DR. DONALD MARKS HOPKINS, M.D.
Radiology at Elderberry Ln, Sacramento, CA
License number
California GFE5717
Category
Radiology
Type
Thoracic Surgery (Cardiothoracic Vascular Surgery)
Address
Address
4100 Elderberry Ln, Sacramento, CA 95864
Phone
(916) 487-3480
(916) 481-3584 (Fax)
(916) 481-3584 (Fax)
Personal information
See more information about DONALD MARKS HOPKINS at radaris.comName
Address
Phone
4724 Shannondale Dr, Antioch, CA 94531
58884 Burnt Valley Rd, Anza, CA 92539
6028 Streamview Dr, San Diego, CA 92115
609 California Ave APT 110, Venice, CA 90291
5737 Whitewater St, Yorba Linda, CA 92887
Professional information
See more information about DONALD MARKS HOPKINS at trustoria.com
Dr. Donald M Hopkins, Sacramento CA - MD (Doctor of Medicine)
Dr. Donald M Hopkins, Sacramento CA - MD (Doctor of Medicine)
Specialties:
Cardiac Surgery
Address:
4100 Elderberry Ln, Sacramento 95864
(916) 487-3480 (Phone), (916) 481-3584 (Fax)
(916) 487-3480 (Phone), (916) 481-3584 (Fax)
Certifications:
General Surgery, 1963, Thoracic Cardiovascular Surgery, 1992, Thoracic Surgery, 1964
Awards:
Healthgrades Honor Roll
Languages:
English
Education:
Medical School
Northwestern Center Feinberg School of Medicine
St Lukes-Presby Hosp
Mayo Clinic-Rochester
Northwestern Center Feinberg School of Medicine
St Lukes-Presby Hosp
Mayo Clinic-Rochester
Method And Apparatus For Stabilizing Pulsed Microwave Amplifiers
Method And Apparatus For Stabilizing Pulsed Microwave Amplifiers
US Patent:
5182524, Jan 26, 1993
Filed:
Mar 10, 1992
Appl. No.:
7/850456
Inventors:
Donald B. Hopkins - Sacramento CA
Assignee:
The Regents of the University of Calif. - Oakland CA
International Classification:
H03F 132
US Classification:
330149
Abstract:
Phase and amplitude variations at the output of a high power pulsed microwave amplifier arising from instabilities of the driving electron beam are suppressed with a feed-forward system that can stabilize pulses which are too brief for regulation by conventional feedback techniques. Such variations tend to be similar during successive pulses. The variations are detected during each pulse by comparing the amplifier output with the low power input signal to obtain phase and amplitude error signals. This enables storage of phase and amplitude correction signals which are used to make compensating changes in the low power input signal during the following amplifier output pulse which suppress the variations. In the preferred form of the invention, successive increments of the correction signals for each pulse are stored in separate channels of a multi-channel storage. Sequential readout of the increments during the next pulse provides variable control voltages to a voltage controlled phase shifter and voltage controlled amplitude modulator in the amplifier input signal path.